Filtro contraste

[schaka]

ok , disculpa, aki va de nuevo

Código Delphi [-]
procedure TFMain.Contrastelog1Click(Sender: TObject);
var i,j,mayor, menor:integer;

begin mayor:=0; menor:=255; 

  (*SE CALCULARA  EL MAXIMO Y MINIMO PIXEL DE UNA IMAGEN Y
  SE LE ASIGNARA  A PIXEL EL VALOR DE LA FORMULA DEL CONTRASTE*) 

 for j := 0 to alto-1 do begin  
PLine := Bitmap.ScanLine[j];
 i:=0;  while i<=( (ancho*3)-1) do 
begin if ((PLine[i]+PLine[i+1]+PLine[i+2]) div 3) > mayor
then begin 
mayor:= ((PLine[i]+PLine[i+1]+PLine[i+2]) div 3) ;
end;   (*if mayor*)
 if (PLine[i]+PLine[i+1]+PLine[i+2]div 3) < menor
then begin 
menor:= ((PLine[i]+PLine[i+1]+PLine[i+2]) div 3) ;
end;   (*if menor*)
 if  ( mayor+ menor )> 0
then begin  pixel :=(mayor-menor)div( mayor+ menor ) ;
end;

i:=i+3;
end; (*while*)
 end;  (*end for j*)     
     for j := 0 to alto-1 do begin      
  PLine := Bitmap.ScanLine[j];      
    i:=0;       
while i<= (ancho*3)-1 do begin  
       if PLine[i] <= 0 then   
      PLine[i]:=1;   PLine[i]:= 2*round(ln(pixel)+ln(PLine[i]))+5;   
  
if PLine[i] <= 0 then  
  begin PLine[i]:=0; end;

  if PLine[i] > 255 then 
   begin PLine[i]:=255;end 

 else begin    PLine[i]:= 2*round(ln(pixel)+ln(PLine[i]))+5; end;

 if PLine[i+1] <= 0 then    
     PLine[i+1]:=1;  
 PLine[i+1]:= 2*round(ln(pixel)+ln(PLine[i+1]))+5; 

 if PLine[i+1] <= 0 then   
  PLine[i+1]:=0;  
 
 if PLine[i+1] > 255 then    
 begin PLine[i+1]:=255;end  

else begin    PLine[i+1]:= 2*round(ln(pixel)+ln(PLine[i+1]))+5;
 end;

 if PLine[i+2] <= 0 then   
      PLine[i+2]:=1;   PLine[i+2]:= 2*round(ln(pixel)+ln(PLine[i+2]))+5; 
 if PLine[i+2] <= 0 then  
   PLine[i+2]:=0;   
 if PLine[i+2] > 255 then    
 begin PLine[i+2]:=255;end 
 else begin PLine[i+2]:= 2*round(ln(pixel)+ln(PLine[i+2]))+5; end;

      i:=i+3;
      end;

      end;

      Image1.Picture.Assign(Bitmap);

      end;    (*begin metodo*)